5 Advantages of polyesterimide enameled wire

In electrical systems such as motors, transformers, and new energy equipment, enameled wire is the “blood vessel” for power transmission and conversion. Polyesterimide enameled wire balances high temperature resistance, corrosion resistance, mechanical strength, and electrical performance through composite coating technology and material optimization, becoming the core material for high-end industrial equipment and high-reliability electronic components. This article deeply analyzes its five core advantages and reveals why it can become the “invisible hero” of modern power equipment.

5 Advantages of polyesterimide enameled wire

• ‌ 1. High temperature resistance: breaking through traditional limits ‌

✅Temperature resistance level:Long-term working temperature is as high as 200°C or above (H-grade insulation), and short-term tolerance temperature exceeds 240°C, far exceeding traditional polyester enameled wire (B-grade, 130°C).

✅Thermal stability ‌:The paint film can still maintain flexibility at high temperatures to avoid cracking or embrittlement, and is suitable for closed high-temperature scenes such as fully enclosed compressors and electric vehicle drive motors.

• 2. Chemical corrosion resistance: against harsh media

✅‌Corrosion resistance‌: Excellent tolerance to acidic gases (such as H_₂S), alkaline coolants, Freon refrigerants, etc., to avoid swelling or peeling of the paint film.

✅‌Composite coating technology‌: The common “double-layer structure” (polyesterimide bottom layer + polyamideimide outer layer) greatly improves chemical resistance and meets the needs of chemical motors and refrigeration equipment.

✅‌Industry application‌: The failure rate of cold chain logistics compressors, industrial inverter windings and other scenarios is reduced by more than 30%.

• 3.Mechanical strength and durability: challenging extreme working conditions

✅‌Paint film adhesion‌: Passed the 3N level paint scraping test (IEC 60851 standard), and withstood the mechanical stress generated by high-speed winding of the winding machine (>1500 rpm).

✅‌Deformation resistance‌: In frequent start-stop scenarios such as dry-type transformers and power tools, it resists micro-cracks in the paint film caused by electromagnetic vibration.

• 4. Electrical insulation performance: safe protection barrier‌‌

✅‌Breakdown voltage‌: The paint film thickness is uniform (typical value 2-5μm), and the breakdown voltage can reach more than 10kV/mm, which effectively prevents inter-turn short circuit.

✅‌Corona resistance‌: Under high-frequency pulse voltage (such as variable frequency motor), the ability to resist partial discharge is better than ordinary enameled wire, reducing the risk of insulation aging.

✅‌Industry standards‌: Comply with international certifications such as IEC 60317-33 and UL 1446, and adapt to the needs of high-voltage motors and power electronic equipment.

• 5. Comprehensive economic and environmental trends‌‌

✅‌Design optimization space‌: High temperature resistance allows the use of more compact winding design and reduces the amount of copper (cost savings of 5-10%).

✅‌Environmental compatibility‌: Lead-free and halogen-free formula meets RoHS and REACH regulations and adapts to the trend of green manufacturing.

✅‌Life cycle cost‌: Long life characteristics reduce the frequency of equipment maintenance, and the full life cycle cost is reduced by 15-25%.

Original Source:Magnet Wires for Power Industry